Bad Air Days in Juncos, Puerto Rico: 5 a Year
5 bad air days a year
More bad air days than three quarters of monitored counties. Ranked 205 of 996 monitored counties, where 1 is worst.
What makes them bad: mostly ozone: summer smog (0% particle days).
When the bad days come in Juncos
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Most bad days here fall in July and March. Averaged over 2016 to 2025.
What actually helps here
- Ozone drives many bad days here. Purifiers and filters do not remove ozone, so do not buy one for that. Ozone peaks on hot afternoons: exercise outside in the morning.
The record for Juncos
In 2000 to 2009 this county averaged 1 bad days a year; in 2016 to 2025, 5. It has got worse. The worst recent year was 2016, with 6 bad days on 303 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2016-03-25 | 225 | Ozone |
| 2016-03-21 | 184 | Ozone |
| 2020-07-18 | 174 | Ozone |
| 2016-03-03 | 155 | Ozone |
| 2016-08-01 | 150 | Ozone |
Most days, not the worst ones
Across 846 monitored days from 2016 to 2020, the air in Juncos rated Good on 98% of them, more often than the 72% typical of monitored counties, and Moderate on 1%. The median day sat at AQI 7; one day in ten went above 18.
The pollutant setting the AQI on an ordinary day here:
- ozone100%846 days
Year by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2020 | 348 | 338 | 4 | 6 | 1 | 9 | 174 |
| 2017 | 195 | 194 | 1 | 0 | 0 | 5 | 90 |
| 2016 | 303 | 295 | 2 | 6 | 3 | 5 | 225 |
| 2015 | 312 | 312 | 0 | 0 | 0 | 19 | 38 |
| 2014 | 344 | 344 | 0 | 0 | 0 | 20 | 38 |
| 2013 | 331 | 331 | 0 | 0 | 0 | 4 | 33 |
| 2012 | 341 | 341 | 0 | 0 | 0 | 21 | 49 |
| 2011 | 307 | 307 | 0 | 0 | 0 | 19 | 37 |
| 2010 | 344 | 344 | 0 | 0 | 0 | 15 | 40 |
Puerto Rico compared
How this is counted
A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day, and on why a purifier does not touch ozone in smoke vs ozone.